One will only have to do that once or twice before your insurance company gives you a cancelation notice. When I move, I actually have the height measurement with me to a assess the "new" home's garage height. Most homes (not necessarliy townhouses) built in the last 20 years are okay.

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S, J.R. Brown
2000 G500 LWB Obsedian Black
2005 Toyota Tacoma Access Cab Off Road Sport
1993 Volvo 240 Sedan Anthracite
1980 450SEL Champange (owned it for 15 years. Great car)
1986 280GE LWB Anthracite (Sold it and kinda wish I hadn't)